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what does real time is less than CPU time mean?

 
Greenhorn
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Hello,

I have benchmarked some code using Java's ThreadMXBean class and compared with normal real time(using System.nanoTime) like this:


After I converted the nano time into secs, I get these kind of results:


What baffled me is that why sometimes Real time can be smaller than CPU time? Is there something I mis understood the usage of the ThreadMXBean?

Thanks,
tbs
 
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I feel you can get better answers in the performance forum. Moving it there ......
 
Zemian Deng
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Can anyone spot a clue to help?

Thanks,
Z
 
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